I've seen threads/posts with 2000-2100 acceptances.
I'm kinda lazy to get the quote but MITChris said something like: "high scores don't mean better brains; they mean more affluent families."
This pretty much means that your SAT scores will be judged based on your context; are you so strikingly poor that you couldn't afford any review materials and used fee waivers for everything? If that's the case even 2100 would be impressive.
But if you are from a middle/upper class family that can afford decent education, you will have to get it up to 2200+ to be safe.
The context is all important. Suppose someone was applying with quite good but not stellar grades. That does not normally match well with MIT. But then you learn that the student's family has been relying on their income since the age of 15, and that these grades were earned while the applicant was working 40-hours a week after finishing high school "full-time". Suddenly those grades look a whole lot more impressive.
And that is the key. Anytime you hear about someone being admitted with 550 on an SAT section, there is usually a context unknown to you that makes that accomplishment a lot more impressive than it seems at first.